Write a conclusion if possible. Cite a law of logic. "If Mark doesn't wear safety glasses, he'll get a speck in his eye. If Mark gets a speck in his eye, he'll go to the doctor."
a) Hypothetical Syllogism - Mark will go to the doctor if he doesn't wear safety glasses.
b) Modus Tollens - Mark wears safety glasses, so he won't get a speck in his eye